How Does A DC Motor Control The Speed?

The motion of a DC motor is completely controlled by a DC motor controller, an electrical device. How does it adjust the speed when in use? Here is a brief introduction to you.

1. The series resistance adjusts the armature circuit. As the series resistance increases, the mechanical properties are weaker and the rotational speed is more unstable. The more energy loss, the lower the power at low speed and the higher the series resistance. Both heavy and light loads affect the speed regulation range.

2. The armature circuit must have an adjustable DC power supply. When the armature voltage drops due to speed regulation, the resistance of the armature circuit and the excitation circuit must be as low as possible.

3. The speed regulation is weakened. Generally speaking, DC motors can only be weak magnetic instead of strong magnetic to avoid oversaturation of the magnetic circuit. When the field weakening speed is adjusted, the load torque will decrease with the increase of the motor speed, forming constant power speed regulation. If the load torque is still at the rated value when the speed increases, the motor power will exceed the rated power and the motor will run with overload. (It should be noted that when using a weak magnetic field for speed regulation, the motor speed should not exceed the allowable limit to prevent the rotor winding of the motor from falling off and damage due to excessive centrifugal force.)

You can learn how to adjust the speed of a DC motor from the Vshida micromotor sharing above. If you would like to know more about DC motors, please feel free to contact us.